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Earth station errors in two-way time transfer

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3 Author(s)
F. G. Ascarrunz ; Time & Frequency Div., Nat. Inst. of Stand. & Technol., Boulder, CO, USA ; S. R. Jefferts ; T. E. Parker

We have investigated the earth station errors in two-way time transfer. A 3.7 m earth station and a very small aperture terminal (VSAT) earth station were used in these experiments along with a transponder located on a mountain about 10 km away. The temperature coefficient of the receive (RX) delay for the 3.7 m NIST earth station was found to be -150 ±30 ps/°C and the temperature coefficient for the transmit (TX) delay was -50±10 ps/°C. The overall temperature coefficient for the earth station was 100±30 ps/°C. Aside from environmental errors there are apparent changes in delay due to characteristics of the modulation/demodulation scheme. Apparent delay changes due to non-linearity effects in the earth station were as high as 10 ns. The errors due to code dependence and third code interference were as high as 3 ns

Published in:

Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.

Date of Conference:

5-7 Jun 1996